/*	$OpenBSD: basename.c,v 1.14 2016/10/28 07:22:59 schwarze Exp $	*/
/*	$NetBSD: basename.c,v 1.9 1995/09/02 05:29:46 jtc Exp $	*/

/*-
 * Copyright (c) 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <err.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "compat.h"

static void usage(void);

int main(int argc, char *argv[]) {
  setprogname(argv[0]);
  int ch;
  char *p;

  while ((ch = getopt(argc, argv, "")) != -1) {
    switch (ch) {
    default:
      usage();
    }
  }
  argc -= optind;
  argv += optind;

  if (argc != 1 && argc != 2)
    usage();

  if (**argv == '\0') {
    (void)puts("");
    return 0;
  }
  p = basename(*argv);
  if (p == NULL)
    err(1, "%s", *argv);
  /*
   * If the suffix operand is present, is not identical to the
   * characters remaining in string, and is identical to a suffix
   * of the characters remaining in string, the suffix suffix
   * shall be removed from string.
   */
  if (*++argv) {
    size_t suffixlen, stringlen, off;

    suffixlen = strlen(*argv);
    stringlen = strlen(p);

    if (suffixlen < stringlen) {
      off = stringlen - suffixlen;
      if (!strcmp(p + off, *argv))
        p[off] = '\0';
    }
  }
  (void)puts(p);
  return 0;
}

static void usage(void) {

  (void)fprintf(stderr, "usage: %s string [suffix]\n", __progname);
  exit(1);
}
